EP2262946B1 - Vorrichtung und verfahren zur verdünnung von zellulose-pulpe - Google Patents

Vorrichtung und verfahren zur verdünnung von zellulose-pulpe Download PDF

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Publication number
EP2262946B1
EP2262946B1 EP09726606.8A EP09726606A EP2262946B1 EP 2262946 B1 EP2262946 B1 EP 2262946B1 EP 09726606 A EP09726606 A EP 09726606A EP 2262946 B1 EP2262946 B1 EP 2262946B1
Authority
EP
European Patent Office
Prior art keywords
pulp
chute
dilution
dilution liquid
nozzles
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP09726606.8A
Other languages
English (en)
French (fr)
Other versions
EP2262946A4 (de
EP2262946A1 (de
Inventor
Magnus Danielsson
Johan Bylander
Mårten DAHL
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valmet Technologies Oy
Original Assignee
Metso Paper Oy
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Filing date
Publication date
Application filed by Metso Paper Oy filed Critical Metso Paper Oy
Publication of EP2262946A1 publication Critical patent/EP2262946A1/de
Publication of EP2262946A4 publication Critical patent/EP2262946A4/de
Application granted granted Critical
Publication of EP2262946B1 publication Critical patent/EP2262946B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents
    • D21C9/06—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents in filters ; Washing of concentrated pulp, e.g. pulp mats, on filtering surfaces
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/18—De-watering; Elimination of cooking or pulp-treating liquors from the pulp

Definitions

  • the present invention relates to an improved device for dilution of cellulose pulp in the form of flocs and to a related method.
  • a ring shaped supply chamber for the addition of dilution liquid has been used in the business for a long time and has for instance been utilized for the dilution of cellulose pulp after HC-Ozon reactors, i.e. bleaching reactors in which cellulose pulp of high consistency, i.e. above approximately 20%, is bleached with Ozon.
  • a HC-Ozon reactor is conventionally a horizontal reactor with an interior transport and mixing screw, which normally is arranged directly after a shredding screw from a wash press, and in which the pulp falls down into a pulp chute after having been treated in the HC-Ozon reactor.
  • the fundamentals of a horizontal Ozon reactor is disclosed, in which the HC-pulp falls freely down into a dilution tank after the reactor.
  • the present invention relates to an improvement of the dilution with respect to a ring shaped supply chamber.
  • An object of the invention is to overcome the problems of the prior art and to evenly distribute the dilution such that substantially the whole pulp volume will have the same consistency. This is achieved by means of a device, according to claim 1.
  • the invention relates to a device for dilution of cellulose pulp of a consistency of between 20 and 45%, which device comprises a pulp chute through which cellulose pulp is arranged to fall down under the addition of dilution liquid, wherein the dilution is performed to a consistency in the range of 6-18%, and wherein the addition of dilution liquid is performed on the falling pulp above a level of established diluted pulp in the bottom of the pulp chute.
  • a central distribution device with a nozzle arranged in the centre of the pulp chute for the addition of dilution liquid to the falling pulp in the centre of the pulp chute and above the level of established diluted pulp in the bottom of the pulp chute, wherein the nozzle is fed with dilution liquid via a pipe that is arranged at least partly through the pulp chute.
  • the dilution liquid is added in the centre of the pulp chute.
  • flocs of pulp are wetted throughout essentially the whole cross section of the pulp chute before the flocs hit the established pulp level in the chute.
  • the degree of wetting decreases with increasing distance from the walls of the pulp chute and is close to zero in the centre of the pulp chute.
  • an even dilution which is especially important with increasing capacity of the plants, and with the invention it is possible to reach a capacity of 4-5000 ADT pulp per day and plant.
  • Another advantage is that it is possible to divide the dilution liquids such that a less aggressive dilution liquid may be added in the periphery as a complement to treat the walls of the pulp chute leniently, wherein a less costly material may be used for these, while more aggressive pH adjusting chemicals, such as acids or bleaching chemicals, are added in the centre of the chute and surrounded by a protecting curtain of less aggressive cellulose pulp, closer to the inner walls of the chute.
  • Figure 1 shows a position in the pulp line where decomposed cellulose pulp in the form of flocs is transported in a screw feeder 1 in which a feed screw 2 feeds flocs of cellulose pulp to a pulp chute 3.
  • the screw feeder 1 may constitute the final part of a pulp shredder or transport screw in a bleaching reactor in which the cellulose pulp is beached at a high consistency, above at least 20%.
  • a dilution device 10 is arranged, which adds dilution liquid to the flow of flocs that falls freely down towards an established level of pulp 6 in the pulp chute 3.
  • the dilution device 1 comprises a line 15 that is drawn to a central distribution device with nozzles 11 arranged in the centre of the pulp chute 3 in order to distribute dilution liquid to the cellulose pulp, as it falls freely in the centre of the pulp chute.
  • a supply chamber 16 which is arranged for adding dilution liquid concentrically around the pulp chute, and which is provided with a plurality of nozzles 14 on the inner wall 3A of the chute 3 (see fig. 2 ) for distributing dilution liquid to the Hocs that falls freely.
  • the diluted pulp which by the addition of dilution liquid has obtained a relatively homogenous concentration, forms an established level 6 of diluted pulp in the bottom of the chute 3.
  • a MC-pump 4 is arranged, which in a conventional manner is provided with a fluidizer 5 in front of the pump wheel of the pump.
  • the fluidizer 5 is at least partly arranged inside the chute 3 and provides a hefty agitation of the cellulose pulp in the bottom of the pulp chute, which is indicated with rotational arrows, and accomplishes the homogenisation of the concentration of the cellulose pulp.
  • the fluidizer is integrated with the pump wheel of the pump, but it may also be separated from the pump wheel and be provided with an own driving means, and placed in immediate connection of the inlet to the pump wheel.
  • I figure 2 an embodiment of the dilution device 10 is shown in a view from below.
  • Dilution liquid is added via the line 12, wherein the dilution liquid reaches a certain pressure inside a supply chamber 16 defined by an outer wall 10A and the inner wall 3A the pulp chute 3.
  • a number of outlets 14 are arranged in the periphery of the pulp chute from the supply chamber 16 and directed inwards, towards the centre of the pulp chute.
  • the pressure in the supply chamber 16 is such that the dilution liquid is sprayed into the pulp chute towards the falling pulp.
  • the pressure control, the shape of the outlet and the quantity of outlets may vary in a number of different way, which are evident to the skilled person. The object is however to yield maximal penetration into the flow of fulling pulp Flocks.
  • the central distribution device comprises at least one pipe 15 5 extending from the wall 3A of the pulp chute 3 inwards, towards the centre of the pulp chute.
  • at least one nozzle 11 is arranged, for the addition oaf at least a part of the dilution liquid.
  • the nozzles 11 may have several outlets and may distribute the dilution liquid in form of a downwardly directed shower stream 11A with a substantially conical jet (see figure 3 ).
  • the dilution liquid may also be added in a direction obliquely upwards or completely horizontally outwards towards the walls 3A in the pulp chute.
  • An advantage of adding the dilution liquid obliquely upwards is that it thus is given more time for mixing with the falling pulp, whereby it of course mixes better.
  • Another advantage is that the energy of impact from the dilution liquid hitting the pulp contributes in mixing the pulp, which leads to that the pulp mixing gets a more homogenous consistency.
  • FIG. 3 An alternative or complement to such a distribution of the nozzles 11 in the centre of the pulp chute 3 is to, as in the shown embodiment, also arrange peripheral outlets 14.
  • the nozzle 11 of the central distribution device is arranged below the peripheral outlets 14 of the supply chamber 16 in the wall 3A of the pulp chute.
  • the addition of dilution liquid is directed towards the upper side of the pipe 11 of the central distribution device, partly in order to keep this free from flocs that otherwise easily may gather thereon. Therefore, as is shown in figure 3 , one of the jets 14B from the peripheral outlets 14 may directed in parallel with the upper side of the pipe 11.
  • the pipe may also be drawn into the pulp chute in the way that is shown in figure 3 , i.e.
  • the pipe 15 also may be drawn in several other fashions. It is of course important that the pipe does not hinder the falling the pulp too much, a certain contact may however be positive since it may function as an agitation of the pulp, which may contribute to better mixing and homogenisation of it.
  • the feeding pipe 15 is provided with a separate feeding, wherein the outlets or nozzles 11 of the central distribution devices may be fed with a different dilution liquid from another source than the one that is being fed to the peripheral nozzles le.
  • a pH-regulating agent, bleaching chemicals or other additives centrally in the pulp chute, whereby the falling flocs of pulp that has been totally or partly diluted with a less aggressive dilution liquid shields off the centrally added dilution liquid such that it does not reach the inner wall a of the pulp chute.
  • the design of the supply chamber 16 and the upper parts of the pulp chute 3 may hence be designed in a simpler and cheaper material, where only the pipe 15 and nozzle 11 of the central distribution device requires materials that are resistant to a concentrated dilution liquid.
  • the pulp chute may therefore be designed with a deaeration canal 13 that is connected to the pulp chute above the supply chamber 10.
  • the deaerated gases may either he released to the surrounding atmosphere or to a decomposition system depending on whether the gases are environmental harmful or not.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)

Claims (11)

  1. Vorrichtung (1) zum Verdünnen celluloser Pülpe mit einer Konsistenz von zwischen 20 und 45 %, wobei die Vorrichtung eine Schütte (3) für die Pülpe aufweist durch die die Pülpe unter der Zugabe von Verdünnungsflüssigkeit hinunterfällt, wobei die Verdünnung auf eine Konsistenz im Bereich von 6-18 % erfolgt und wobei die Zugabe der Verdünnungsflüssigkeit auf die fallende Pülpe über einem Niveau (6) erfolgt, das der angekommenen, verdünnten Pülpe am Boden der Pülpeschütte entspricht, dadurch gekennzeichnet, dass eine zentrale Verteilungsvorrichtung mit einer Düse (11) im Zentrum der Pülpeschütte (3) für die Zugabe vom Verdünnungsflüssigkeit für die fallende Pülpe im Zentrum der Pülpeschütte (3) und oberhalb des Niveaus (6) der verdünnten, angekommenen Pülpe am Boden der Pülpeschütte angeordnet ist, wobei die Düse (11) mit Verdünnungsflüssigkeit über ein Rohr (15) versorgt wird, das zumindest teilweise durch die Pülpeschütte hindurch angeordnet ist.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die zentrale Verteilungsvorrichtung einige Düsen (11) umfasst, die gleichmäßig über die Breite der Pülpeschütte verteilt sind.
  3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass eine periphere Verteilungsvorrichtung mit peripheren Düsen (14) vorgesehen ist, um Verdünnungsflüssigkeit von der inneren Wand (3A) der Pülpeschütte her zuzuführen.
  4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass die zentrale Verteilungsvorrichtung unter den Düsen (14) der peripheren Verteilungsvorrichtung vorgesehen ist.
  5. Vorrichtung nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass die Zufuhr zu den Düsen (11) der zentralen Verteilungsvorrichtung von der Zufuhr zu den Düsen (14) der peripheren Verdünnungsvorrichtung getrennt ist, wodurch Verdünnungsflüssigkeit von unterschiedlichen Quellen zu den Düsen (11 bzw. 14) geführt werden kann.
  6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass ein Entlüftungskanal (13) in Verbindung mit der Pülpeschütte 3 oberhalb der Düsen (11, 14) angeordnet ist.
  7. Verfahren zum Verdünnen celluloser Pülpe mit einer Konsistenz von zwischen 20 und 45 %, wobei Verdünnungsflüssigkeit der cellulosen Pülpe in einer Pülpeschütte zugegeben wird, wobei die Verdünnung bis zu einer Konsistenz im Bereich von 16-18 % erfolgt, wenn sich die cellulose Pülpe im freien Fall oberhalb eines Niveaus der am Boden der Pülpeschütte ruhenden, verdünnten Pülpe befindet, dadurch gekennzeichnet, dass Verdünnungsflüssigkeit im Zentrum der Pülpeschütte zugeführt wird.
  8. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass die Verdünnungsflüssigkeit aus einigen Düsen zugeführt wird, die im Wesentlichen gleichmäßig über der Breite der Pülpeschütte verteilt sind.
  9. Verfahren nach Anspruch 7 oder 8, dadurch gekennzeichnet, dass die Verdünnungsflüssigkeit auch von der Innenwand (3A) der Pülpeschütte zugeführt wird.
  10. Verfahren nach Anspruch 9, dadurch gekennzeichnet, dass verschiedene Verdünnungsflüssigkeiten im Zentrum und in der Peripherie der Pülpeschütte zugegeben werden, wobei die Verdünnungsflüssigkeit, die im Zentrum der Pülpeschütte zugegeben wird, vorzugsweise stärker konzentriert ist, als die Verdünnungsflüssigkeit die an der Peripherie der Pülpeschütte zugegeben wird.
  11. Verfahren nach einem der Ansprüche 7-10, dadurch gekennzeichnet, dass zumindest 25 % der Verdünnungsflüssigkeit im Zentrum der Pülpeschütte zugegeben werden.
EP09726606.8A 2008-03-31 2009-03-20 Vorrichtung und verfahren zur verdünnung von zellulose-pulpe Not-in-force EP2262946B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0800718A SE531079C2 (sv) 2008-03-31 2008-03-31 Anordning samt förfarande för spädning av cellulosamassa
PCT/SE2009/050294 WO2009123546A1 (en) 2008-03-31 2009-03-20 Device and method for dilution of cellulose pulp

Publications (3)

Publication Number Publication Date
EP2262946A1 EP2262946A1 (de) 2010-12-22
EP2262946A4 EP2262946A4 (de) 2013-03-27
EP2262946B1 true EP2262946B1 (de) 2013-11-20

Family

ID=40084544

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09726606.8A Not-in-force EP2262946B1 (de) 2008-03-31 2009-03-20 Vorrichtung und verfahren zur verdünnung von zellulose-pulpe

Country Status (7)

Country Link
US (1) US20110005696A1 (de)
EP (1) EP2262946B1 (de)
CN (1) CN101981250A (de)
BR (1) BRPI0909263A2 (de)
CA (1) CA2716495A1 (de)
SE (1) SE531079C2 (de)
WO (1) WO2009123546A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE531079C2 (sv) * 2008-03-31 2008-12-09 Metso Paper Inc Anordning samt förfarande för spädning av cellulosamassa
RU2650066C2 (ru) * 2013-01-04 2018-04-06 Зульцер Мэнэджмент Аг Способ и устройство для переноса технологической жидкости, промышленное предприятие и способ упрощения его схемы
CN107981407B (zh) * 2018-01-19 2020-04-17 河南卷烟工业烟草薄片有限公司 一种无动力造纸法再造烟叶生产过程混料装置

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2614923A (en) * 1946-04-17 1952-10-21 Sunila Osakeyhtio Digester filling in sulfate pulping
US3445328A (en) * 1964-01-25 1969-05-20 Kamyr Ab Method for continuous cellulose digestion utilizing two temperature zones
US3427218A (en) * 1964-07-10 1969-02-11 Kamyr Ab Method of performing counter-current continuous cellulose digestion
SE431662B (sv) * 1974-07-05 1984-02-20 Kamyr Ab Sett vid kontinuerlig kokning av fibermaterial
CA1056636A (en) * 1975-04-07 1979-06-19 Jerry Zucker Digester system and method
US4568419A (en) * 1984-02-27 1986-02-04 Laakso Oliver A Method of treating comminuted cellulosic fibrous material in a vertical vessel
FI80303C (fi) * 1986-11-28 1991-04-10 Ahlstroem Oy Tjockmassatorn.
SE502064C2 (sv) * 1993-11-29 1995-07-31 Kvaerner Pulping Tech Sätt och anordning för utmatning av fibermassa
FI98836C (fi) * 1994-06-09 1997-08-25 Ahlstroem Pumput Oy Korkeasakeusmassatorni
SE526292C2 (sv) * 2004-04-07 2005-08-16 Kvaerner Pulping Tech Förfarande och anordning för utspädning av avvattnad cellulosamassa
SE529848C2 (sv) * 2006-04-10 2007-12-11 Metso Paper Inc Förfarande och anordning för matning av massa från en avvattningsenhet
SE531079C2 (sv) * 2008-03-31 2008-12-09 Metso Paper Inc Anordning samt förfarande för spädning av cellulosamassa
US8801898B2 (en) * 2009-08-19 2014-08-12 Valmet Ab Method and arrangement for adding treatment liquors to cellulose raw material in a continuous process using down flow vessels

Also Published As

Publication number Publication date
BRPI0909263A2 (pt) 2015-08-18
US20110005696A1 (en) 2011-01-13
CA2716495A1 (en) 2009-10-08
EP2262946A4 (de) 2013-03-27
CN101981250A (zh) 2011-02-23
WO2009123546A1 (en) 2009-10-08
SE0800718L (sv) 2008-12-09
SE531079C2 (sv) 2008-12-09
EP2262946A1 (de) 2010-12-22

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